A close confidante to the late ruler of Dubai, the former United Arab Emirates ambassador to the U.K. got his start negotiating lucrative trade deals as head of Dubai customs. Has since invested fortune in manufacturing, real estate and art: owns a glass-bottling company in Dubai, London's Park Tower Hotel, a private bank in the Cayman Islands and nearly 18,000 acres of land in Perthshire, Scotland, where his Highland Spring company bottles the U.K.'s second leading brand of mineral water. Reclusive sheikh is known for his collections of pearls, silver, carpets. Recently formed joint venture with fine art auction house Bonhams to open Dubai location.